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Complete the Ignitor III installation by connecting the red wire to the coil. Also, it is mandatory you not use the factory's pink resistor power lead for the Ignitor III because your engine will not start. Bypass the factory resistor wire with 12-gauge wire because the Ignitor III requires a full 12-volts to function. Bypass the resistor wire by going behind your Mustang's instrument panel and going directly to the power source.